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Erythrocyte deformability refers to the ability of erythrocytes (red blood cells, RBC) to change shape under a given level of applied stress, without hemolysing (rupturing).rythrocyte deformability is an important determinant of blood viscosity, hence blood flow resistance in the vascular system. It affects blood flow in large blood vessels, due to the increased frictional resistance between fluid laminae under laminar flow conditions.
Scalable means that something is able to grow larger and still maintain its current level of effectiveness. In your sentence: There is no scalable technology that can teach a child to read, only a teacher can do that the author is using scalable to concede this point: There may be technologies out there that can teach a particular child to read, or help to do so, but these technologies are not scalable.